. ♪ [ continues ] [ gasping ] >>> i saw a fascinating report about the debt ceiling on cnn. take a look at this. >> in the coming weeks congress will once again grapple with america's spiraling national debt currently around $16 trillion. the exact figure is calculated constantly by the national debt clock, a clock, costing nearly $4 bill per day to operate the national debt clock is the cause of most of the national debt. more news after this. >> i didn't know that. $4 billion to operate the clock. >> that's why letterman said let's just unplug the clock and we'll solve the whole debt problem. very, very funny. >>> now to a story that's not so funny and causing a lot of concerns. boeing's groundbreaking 787 dreamliner was delayed for years because of produced trouble. now the company is dealing with two new 787 incidents in the past two days. >> boeing's stock is falling after the latest problems with the dreamliner. as mark strassmann reports, one of those jets sprung a leak yesterday before takeoff. >> reporter: as the boeing 787 dreamliner taxied to the runway approximat